Abstract
Tests on pure calcium hydroxide solutions have shown that solubility of calcium hydroxide decreases when alkali content increases. With addition of sulfate Ca 2+, concentration of the solution is higher than without it. Higher Ca 2+ concentration is not due to an oversaturation with Ca(OH) 2 but to the higher solubility of calcium sulfate. A similar result also was attained in solutions which are in contact with cement. In those cases Ca 2+ concentration in the solution decreased to the same extent the originally dissolved sulfate was precipitated as ettringite or monosulfate and finally it reached the value corresponding to the Ca(OH) 2 equilibrium. The solutions' pH value rose with increasing alkali content. This effect, however, clearly decreased from potassium to sodium to lithium. If lithium was added to a solution already containing potassium, the pH value decreased although OH-concentration of the solution continued to increase.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
